JavaScript 动画
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2022-03-10 16:44:07
动画原理 Document 动画原理 Document 夏雨荷 动画封装 Document 点击夏雨荷才走 夏雨荷 不同动画缓动动画 Document 点击夏雨荷才走 夏雨荷 ... ......
动画原理
<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="x-ua-compatible" content="ie=edge"> <title>document</title> <style> div { position: absolute; left: 0; width: 100px; height: 100px; background-color: pink; } </style> </head> <body> <div></div> <script> var div = document.queryselector('div'); var tinner = setinterval(function () { if (div.offsetleft > 400) { clearinterval(tinner); } div.style.left = div.offsetleft + 1 + 'px' }, 30) </script> </body> </html>
<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="x-ua-compatible" content="ie=edge"> <title>document</title> <style> div { position: absolute; left: 0; width: 100px; height: 100px; background-color: pink; } span { position: absolute; left: 0; top: 200px; display: block; width: 150px; height: 150px; background-color: purple; } </style> </head> <body> <div></div> <span>夏雨荷</span> <script> function animate(obj, target) { var inner = setinterval(function () { if (obj.offsetleft >= target) { clearinterval(inner) } obj.style.left = obj.offsetleft + 1 + 'px' },30) } var div = document.queryselector('div'); var span = document.queryselector('span'); animate(div, 200); animate(span, 300); </script> </body> </html>
<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="x-ua-compatible" content="ie=edge"> <title>document</title> <style> div { position: absolute; left: 0; width: 100px; height: 100px; background-color: pink; } span { position: absolute; left: 0; top: 200px; display: block; width: 150px; height: 150px; background-color: purple; } </style> </head> <body> <button>点击夏雨荷才走</button> <div></div> <span>夏雨荷</span> <script> var btn = document.queryselector('button'); var div = document.queryselector('div'); var span = document.queryselector('span'); function move(obj, target) { clearinterval(obj.tinner); // 防止多次点击 obj.tinner = setinterval(function () { if (obj.offsetleft >=target) { clearinterval(tinner) } obj.style.left = obj.offsetleft + 1 + 'px' },10) } move(div, 300); btn.addeventlistener('click', function () { move(span,400) }) </script> </body> </html>
缓动动画
<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="x-ua-compatible" content="ie=edge"> <title>document</title> <style> div { position: absolute; left: 0; width: 100px; height: 100px; background-color: pink; } span { position: absolute; left: 0; top: 200px; display: block; width: 150px; height: 150px; background-color: purple; } </style> </head> <body> <button>点击夏雨荷才走</button> <span>夏雨荷</span> <script> // 缓动动画函数封装obj目标对象 target 目标位置 // 思路: // 1. 让盒子每次移动的距离慢慢变小, 速度就会慢慢落下来。 // 2. 核心算法:(目标值 - 现在的位置) / 10 做为每次移动的距离 步长 // 3. 停止的条件是: 让当前盒子位置等于目标位置就停止定时器 function animate(obj, target) { // 先清除以前的定时器,只保留当前的一个定时器执行 clearinterval(obj.timer); obj.timer = setinterval(function() { // 步长值写到定时器的里面 var step = (target - obj.offsetleft) / 30; if (obj.offsetleft == target) { // 停止动画 本质是停止定时器 clearinterval(obj.timer); } // 把每次加1 这个步长值改为一个慢慢变小的值 步长公式:(目标值 - 现在的位置) / 10 obj.style.left = obj.offsetleft + step + 'px'; }, 15); } var span = document.queryselector('span'); var btn = document.queryselector('button'); btn.addeventlistener('click', function() { // 调用函数 animate(span, 500); }) // 匀速动画 就是 盒子是当前的位置 + 固定的值 10 // 缓动动画就是 盒子当前的位置 + 变化的值(目标值 - 现在的位置) / 10) </script> </body> </html>
<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="x-ua-compatible" content="ie=edge"> <title>document</title> <style> span { position: absolute; left: 0; top: 200px; display: block; width: 150px; height: 150px; background-color: purple; } </style> </head> <body> <button class="btn500">点击夏雨荷到500</button> <button class="btn800">点击夏雨荷到800</button> <span>夏雨荷</span> <script> function animate(obj, target) { // 清理定时器,防止多次点击 clearinterval(obj.timer); obj.timer = setinterval(function () { // 把我们步长值改为整数 不要出现小数的问题 var step = (target - obj.offsetleft) / 10; step = step > 0 ? math.ceil(step) : math.floor(step); // 到达目标就清除 if (obj.offsetleft == target) { clearinterval(obj.timer); } obj.style.left = obj.offsetleft + step + 'px' }, 15); } var btn500 = document.queryselector('.btn500'); var btn800 = document.queryselector('.btn800'); var span = document.queryselector('span'); btn500.onclick = function () { animate(span, 500); }; btn800.onclick = function () { animate(span, 800); } </script> </body> </html>
<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="x-ua-compatible" content="ie=edge"> <title>document</title> <style> span { position: absolute; left: 0; top: 200px; display: block; width: 150px; height: 150px; background-color: purple; } </style> </head> <body> <button class="btn500">点击夏雨荷到500</button> <button class="btn800">点击夏雨荷到800</button> <span>夏雨荷</span> <script> function animate(obj, target, callback) { // 清理定时器,防止多次点击 clearinterval(obj.timer); obj.timer = setinterval(function () { // 把我们步长值改为整数 不要出现小数的问题 var step = (target - obj.offsetleft) / 10; step = step > 0 ? math.ceil(step) : math.floor(step); // 到达目标就清除 if (obj.offsetleft == target) { clearinterval(obj.timer); // 回调函数 if (callback){ callback() } } obj.style.left = obj.offsetleft + step + 'px' }, 15); } var btn500 = document.queryselector('.btn500'); var btn800 = document.queryselector('.btn800'); var span = document.queryselector('span'); btn500.onclick = function () { animate(span, 500); }; btn800.onclick = function () { animate(span, 800, function () { span.style.backgroundcolor = 'red'; // 回调函数 }); } </script> </body> </html>
<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="x-ua-compatible" content="ie=edge"> <title>document</title> <style> .sliderbar { position: fixed; right: 0; bottom: 100px; width: 40px; height: 40px; text-align: center; line-height: 40px; cursor: pointer; color: #fff; } .con { position: absolute; left: 0; top: 0; width: 200px; height: 40px; background-color: purple; z-index: -1; } </style> <script src="animate.js"></script> </head> <body> <div class="sliderbar"> <span>←</span> <div class="con">问题反馈</div> </div> <script> // 获取元素 var sliderbar = document.queryselector('.sliderbar'); var con = document.queryselector('.con'); sliderbar.onmouseenter = function () { animate(con, -160, function() { // 当我们动画执行完毕,就把 ← 改为 → sliderbar.children[0].innerhtml = '→'; }); }; sliderbar.onmouseleave = function () { animate(con, 0, function() { // 当我们动画执行完毕,就把 → 改为 ← sliderbar.children[0].innerhtml = '←'; }); } </script> </body> </html>
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